CN109022724A - A kind of endurance automobile gear treatment process - Google Patents
A kind of endurance automobile gear treatment process Download PDFInfo
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- CN109022724A CN109022724A CN201811180907.5A CN201811180907A CN109022724A CN 109022724 A CN109022724 A CN 109022724A CN 201811180907 A CN201811180907 A CN 201811180907A CN 109022724 A CN109022724 A CN 109022724A
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- automobile gear
- temperature
- endurance
- nitrogen
- treatment process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses a kind of endurance automobile gear treatment process, are related to gear technique field, comprising the following steps: (1) clean；(2) it is dissolved modification；(3) it is tempered modification；The present invention passes through a large amount of experimental study, is largely optimized to the process of surface treatment of automobile gear, can effectively improve automobile gear institutional framework, strengthening surface layer, to carry out great improvement to automobile gear surface composition of layer, tissue, performance.
Description
Technical field
The invention belongs to gear technique fields, and in particular to a kind of endurance automobile gear treatment process.
Background technique
Gear refers to mechanical organ that is with teeth on wheel rim and can continuously engaging passing movement and power, is mutually to nibble
The machine components with teeth closed, there have been since gear carries out transmitting work in the car very early for application of the gear in transmission
When making, suffered power is larger, while when transmitting power, and being mutually twisted between the vibration of itself and gear all can in the process
By certain power, if things go on like this, gear will receive certain fatigue damage, so that transfer performance can be greatly reduced, therefore, such as
The fatigue performance what improves gear is required technical problems to be solved.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of endurance automobile gear treatment process is provided.
The present invention is achieved by the following technical solutions:
A kind of endurance automobile gear treatment process, comprising the following steps:
(1) it cleans:
Soaking and washing processing is carried out to automobile gear using lye, the soaking and washing time is 20-25min, is then further taken out, then
Automobile gear is put into dehydrated alcohol again and impregnates 3min, is then taken out, drying to constant weight；
(2) it is dissolved modification:
Automobile gear is subjected to solid solution modification, the process conditions of the solid solution modification are as follows: with 1.5 in electrothermal furnace
DEG C/heating rate of s is warming up to 225 DEG C, 5-8min is kept the temperature, is passed through neon and nitrogen mixed gas, then again then with 0.3 DEG C/s
Heating rate be heated to 980 DEG C, isothermal holding 45-50min, temperature is then reduced to 335 with the rate of temperature fall of 0.6 DEG C/s again
DEG C, 40min is kept the temperature, is further continued for being reduced to 70 DEG C with identical rate of temperature fall, then automobile gear is dipped into temperature again by heat preservation
To impregnate 40min, then taking out, cleaned using deionized water to automobile gear, be dried to perseverance in 35 DEG C of maceration extracts
Weight, the maceration extract is made of following component by weight: triethyl group hexyl phosphoric acid 1.5-1.9, phosphoric acid 3.6-3.8,
Nitric acid 2.5-2.7, alkyl phenol polyoxyethylene ether 3-5, silane coupling agent 1.3-1.7, ethyl alcohol 4-6, deionized water 50；
(3) it is tempered modification:
Automobile gear is put into ion nitriding furnace, and the air pressure in ion nitriding furnace is evacuated to 12Pa, to ionic nitriding
It is passed through helium in furnace and carries out ion bombardment, stops being passed through for helium when the temperature in ion nitriding furnace reaches 380-385 DEG C, protects
Temperature 1.2 hours, is then passed through nitrogen and hydrogen again, carries out low-pressure glow discharge nitriding, and adjust nitrogen and hydrogen is passed through pressure, makes
Pressure in ion nitriding furnace is 212-214Pa, is handled 3.5 hours, then after cooled to room temperature, is taken out.
Further, lye described in step (1) is the sodium hydroxide solution that mass fraction is 10%.
Further, dipping by lye temperature as described in step (1) is 45 DEG C.
Further, neon and nitrogen press 3:1 at normal temperatures and pressures in neon described in step (2) and nitrogen mixed gas
Volume ratio is mixed to get.
Further, neon described in step (2) and nitrogen mixed gas pressure are 38MPa.
Further, nitrogen described in step (3) and hydrogen normal temperature and pressure volume ratio are 2:1.
The utility model has the advantages that the present invention passes through a large amount of experimental study, the process of surface treatment of automobile gear is carried out a large amount of
Optimization, can effectively improve automobile gear institutional framework, strengthening surface layer, thus to automobile gear surface composition of layer, tissue,
Performance has carried out great improvement, improves the surface abrasion resistance and fatigue durability of automobile gear, improves the use of automobile gear
Service life.The present invention is by that after heat treatment, using maceration extract impregnation, can form a thin layer of densification in bearing surface
Phosphate coating can not only be diffused activation when then carrying out tempering modification again to phosphorus atoms, thus to P elements, nitrogen
Element, carbon form more excellent compisite seeping layer on automobile gear surface, to improve the fatigue durability on automobile gear surface,
High temperature oxidation resistance first carries out solid solution modification through the invention and carries out tempering modification, automobile gear clad surface again
Microhardness highest, coating thickness uniformly, be evenly distributed, fine and close, complete, the binding ability of coating and basis material is stronger,
Automobile gear interior tissue crystal grain more refines, and texture performance is significantly enhanced, and can further improve resistance to tired
Labor performance and proof stress disruptiveness.
By the processing of invented technology, is introduced on automobile gear surface and produce very high compression, thus greatly
Its fatigue resistance is improved, test proves that can be improved 10-12 times of fatigue resistance compared to conventional treatment, automobile gear
The phenomenon that fracture and tearing, is greatly reduced, and automobile gear internal structure and surface texture occur conversion and combine,
Flexural strength, tensile property and the toughness of automobile gear are all greatly improved.
Specific embodiment
Embodiment 1
A kind of endurance automobile gear treatment process, comprising the following steps:
(1) it cleans:
Soaking and washing processing is carried out to automobile gear using lye, the soaking and washing time is 20min, is then further taken out, then again
Automobile gear is put into dehydrated alcohol and impregnates 3min, is then taken out, drying to constant weight；
(2) it is dissolved modification:
Automobile gear is subjected to solid solution modification, the process conditions of the solid solution modification are as follows: with 1.5 in electrothermal furnace
DEG C/heating rate of s is warming up to 225 DEG C, 5min is kept the temperature, is passed through neon and nitrogen mixed gas, then again then with 0.3 DEG C/s's
Heating rate is heated to 980 DEG C, isothermal holding 45min, then reduces temperature to 335 DEG C with the rate of temperature fall of 0.6 DEG C/s again, protects
Warm 40min is further continued for being reduced to 70 DEG C with identical rate of temperature fall, and heat preservation, it is 35 that automobile gear, which is then dipped into temperature, again
DEG C maceration extract in, impregnate 40min, then take out, automobile gear cleaned using deionized water, drying to constant weight, i.e.,
Can, the maceration extract is made of following component by weight: triethyl group hexyl phosphoric acid 1.5, phosphoric acid 3.6, nitric acid 2.5, alkyl
Phenol polyethenoxy ether 3, silane coupling agent 1.3, ethyl alcohol 4, deionized water 50；
(3) it is tempered modification:
Automobile gear is put into ion nitriding furnace, and the air pressure in ion nitriding furnace is evacuated to 12Pa, to ionic nitriding
It is passed through helium in furnace and carries out ion bombardment, stops being passed through for helium when the temperature in ion nitriding furnace reaches 380 DEG C, keeps the temperature
1.2 hours, be then passed through nitrogen and hydrogen again, carry out low-pressure glow discharge nitriding, adjust nitrogen and hydrogen is passed through pressure, make from
Pressure in sub- nitriding furnace is 212Pa, is handled 3.5 hours, then after cooled to room temperature, is taken out.
Further, lye described in step (1) is the sodium hydroxide solution that mass fraction is 10%.
Further, dipping by lye temperature as described in step (1) is 45 DEG C.
Further, neon and nitrogen press 3:1 at normal temperatures and pressures in neon described in step (2) and nitrogen mixed gas
Volume ratio is mixed to get.
Further, neon described in step (2) and nitrogen mixed gas pressure are 38MPa.
Further, nitrogen described in step (3) and hydrogen normal temperature and pressure volume ratio are 2:1.
Embodiment 2
A kind of endurance automobile gear treatment process, comprising the following steps:
(1) it cleans:
Soaking and washing processing is carried out to automobile gear using lye, the soaking and washing time is 25min, is then further taken out, then again
Automobile gear is put into dehydrated alcohol and impregnates 3min, is then taken out, drying to constant weight；
(2) it is dissolved modification:
Automobile gear is subjected to solid solution modification, the process conditions of the solid solution modification are as follows: with 1.5 in electrothermal furnace
DEG C/heating rate of s is warming up to 225 DEG C, 8min is kept the temperature, is passed through neon and nitrogen mixed gas, then again then with 0.3 DEG C/s's
Heating rate is heated to 980 DEG C, isothermal holding 50min, then reduces temperature to 335 DEG C with the rate of temperature fall of 0.6 DEG C/s again, protects
Warm 40min is further continued for being reduced to 70 DEG C with identical rate of temperature fall, and heat preservation, it is 35 that automobile gear, which is then dipped into temperature, again
DEG C maceration extract in, impregnate 40min, then take out, automobile gear cleaned using deionized water, drying to constant weight, i.e.,
Can, the maceration extract is made of following component by weight: triethyl group hexyl phosphoric acid 1.9, phosphoric acid 3.8, nitric acid 2.7, alkyl
Phenol polyethenoxy ether 5, silane coupling agent 1.7, ethyl alcohol 6, deionized water 50；
(3) it is tempered modification:
Automobile gear is put into ion nitriding furnace, and the air pressure in ion nitriding furnace is evacuated to 12Pa, to ionic nitriding
It is passed through helium in furnace and carries out ion bombardment, stops being passed through for helium when the temperature in ion nitriding furnace reaches 385 DEG C, keeps the temperature
1.2 hours, be then passed through nitrogen and hydrogen again, carry out low-pressure glow discharge nitriding, adjust nitrogen and hydrogen is passed through pressure, make from
Pressure in sub- nitriding furnace is 214Pa, is handled 3.5 hours, then after cooled to room temperature, is taken out.
Further, lye described in step (1) is the sodium hydroxide solution that mass fraction is 10%.
Further, dipping by lye temperature as described in step (1) is 45 DEG C.
Further, neon and nitrogen press 3:1 at normal temperatures and pressures in neon described in step (2) and nitrogen mixed gas
Volume ratio is mixed to get.
Further, neon described in step (2) and nitrogen mixed gas pressure are 38MPa.
Further, nitrogen described in step (3) and hydrogen normal temperature and pressure volume ratio are 2:1.
Embodiment 3
A kind of endurance automobile gear treatment process, comprising the following steps:
(1) it cleans:
Soaking and washing processing is carried out to automobile gear using lye, the soaking and washing time is 22min, is then further taken out, then again
Automobile gear is put into dehydrated alcohol and impregnates 3min, is then taken out, drying to constant weight；
(2) it is dissolved modification:
Automobile gear is subjected to solid solution modification, the process conditions of the solid solution modification are as follows: with 1.5 in electrothermal furnace
DEG C/heating rate of s is warming up to 225 DEG C, 6min is kept the temperature, is passed through neon and nitrogen mixed gas, then again then with 0.3 DEG C/s's
Heating rate is heated to 980 DEG C, isothermal holding 49min, then reduces temperature to 335 DEG C with the rate of temperature fall of 0.6 DEG C/s again, protects
Warm 40min is further continued for being reduced to 70 DEG C with identical rate of temperature fall, and heat preservation, it is 35 that automobile gear, which is then dipped into temperature, again
DEG C maceration extract in, impregnate 40min, then take out, automobile gear cleaned using deionized water, drying to constant weight, i.e.,
Can, the maceration extract is made of following component by weight: triethyl group hexyl phosphoric acid 1.6, phosphoric acid 3.7, nitric acid 2.6, alkyl
Phenol polyethenoxy ether 4, silane coupling agent 1.5, ethyl alcohol 5, deionized water 50；
(3) it is tempered modification:
Automobile gear is put into ion nitriding furnace, and the air pressure in ion nitriding furnace is evacuated to 12Pa, to ionic nitriding
It is passed through helium in furnace and carries out ion bombardment, stops being passed through for helium when the temperature in ion nitriding furnace reaches 382 DEG C, keeps the temperature
1.2 hours, be then passed through nitrogen and hydrogen again, carry out low-pressure glow discharge nitriding, adjust nitrogen and hydrogen is passed through pressure, make from
Pressure in sub- nitriding furnace is 213Pa, is handled 3.5 hours, then after cooled to room temperature, is taken out.
Further, lye described in step (1) is the sodium hydroxide solution that mass fraction is 10%.
Further, dipping by lye temperature as described in step (1) is 45 DEG C.
Further, neon and nitrogen press 3:1 at normal temperatures and pressures in neon described in step (2) and nitrogen mixed gas
Volume ratio is mixed to get.
Further, neon described in step (2) and nitrogen mixed gas pressure are 38MPa.
Further, nitrogen described in step (3) and hydrogen normal temperature and pressure volume ratio are 2:1.
Comparative example 1: it is only that with the difference of embodiment 1 and is handled without step (2).
Comparative example 2: it is only that with the difference of embodiment 1 and is handled without step (3).
Comparative example 3: it is only that in step (2) with the difference of embodiment 1 and does not use maceration extract to handle.
Comparative example 4: being only that in step (3) with the difference of embodiment 1 and carry out conventional tempering, is heated to 380 DEG C, heat preservation
2 hours, then cooled to room temperature.
Control group: use application number: 201510830474.3 techniques are handled.
Automobile gear by specification identical GCr15 material preparation be sample using embodiment at comparative example method
Reason, comparison；
Thermal fatigue test is carried out from constraint thermal fatigue tester using resistance stove heating.Heat fatigue sample is loaded on cube fixture
Four sides guarantee the heating and cooling position consistency of every piece of sample.It is moved vertically up and down by transmission device, to reach examination
Sample heating and cooling automatically complete.Using automatic control when setting, thermocouple measurement simultaneously controls temperature.Sample 25 DEG C of room temperature extremely
It carries out heating between 820 DEG C and cooling thermal cycle.It is counted automatically using counter.It adjusts and is kept for 820 DEG C of furnace temperature, water
Warm 20 DEG C (flowing running water).Quick heating sample.It heats, is cooling once as a circulation, each circulating-heating time is
120s, entering water cooling time is 5s, until predetermined cycle-index.For the sample of research heat fatigue cracking germinating, every circulation 400
It is secondary, sample, polishing removal surface film oxide are removed, measurement face crack length is write down using 0.1mm as crack initiation length
Sample crack initiation cycle-index.It observes and takes a picture to the germinating position of crackle.For studying the sample of crack propagation of thermal fatigue,
Every circulation 200 times, removes sample, polishes and observe.After determining that crackle has germinated, 200 observation crackles of every circulation and to energy
Reflect the position photograph of crack propagation path feature:
Table 1
As can be seen from Table 1, when proceeding to 13000 times, control group processing automobile gear heat fatigue cracking length,
Width and depth etc. start to extend, but the automobile gear not yet crack initiation that the present invention is handled；When proceeding to 24000 times,
The automobile gear crackle of control group processing becomes coarseer, and occurs in the gap of the automobile gear crackle of control group processing bright
Aobvious oxidation sign；But when the automobile gear that the present invention is handled proceeds to 30000 times, crackle is only 0.11mm, and the present invention
The automobile gear crack propagation of processing is more balanced, and lead crack is slower with respect to other tissue developments, therefore, handles by the present invention
Automobile gear fatigue performance it is more superior.
Claims (6)
1. a kind of endurance automobile gear treatment process, which comprises the following steps:
(1) it cleans:
Soaking and washing processing is carried out to automobile gear using lye, the soaking and washing time is 20-25min, is then further taken out, then
Automobile gear is put into dehydrated alcohol again and impregnates 3min, is then taken out, drying to constant weight；
(2) it is dissolved modification:
Automobile gear is subjected to solid solution modification, the process conditions of the solid solution modification are as follows: with 1.5 in electrothermal furnace
DEG C/heating rate of s is warming up to 225 DEG C, 5-8min is kept the temperature, is passed through neon and nitrogen mixed gas, then again then with 0.3 DEG C/s
Heating rate be heated to 980 DEG C, isothermal holding 45-50min, temperature is then reduced to 335 with the rate of temperature fall of 0.6 DEG C/s again
DEG C, 40min is kept the temperature, is further continued for being reduced to 70 DEG C with identical rate of temperature fall, then automobile gear is dipped into temperature again by heat preservation
To impregnate 40min, then taking out, cleaned using deionized water to automobile gear, be dried to perseverance in 35 DEG C of maceration extracts
Weight, the maceration extract is made of following component by weight: triethyl group hexyl phosphoric acid 1.5-1.9, phosphoric acid 3.6-3.8,
Nitric acid 2.5-2.7, alkyl phenol polyoxyethylene ether 3-5, silane coupling agent 1.3-1.7, ethyl alcohol 4-6, deionized water 50；
(3) it is tempered modification:
Automobile gear is put into ion nitriding furnace, and the air pressure in ion nitriding furnace is evacuated to 12Pa, to ionic nitriding
It is passed through helium in furnace and carries out ion bombardment, stops being passed through for helium when the temperature in ion nitriding furnace reaches 380-385 DEG C, protects
Temperature 1.2 hours, is then passed through nitrogen and hydrogen again, carries out low-pressure glow discharge nitriding, and adjust nitrogen and hydrogen is passed through pressure, makes
Pressure in ion nitriding furnace is 212-214Pa, is handled 3.5 hours, then after cooled to room temperature, is taken out.
2. a kind of endurance automobile gear treatment process as described in claim 1, which is characterized in that alkali described in step (1)
Liquid is the sodium hydroxide solution that mass fraction is 10%.
3. a kind of endurance automobile gear treatment process as described in claim 1, which is characterized in that as described in step (1)
Dipping by lye temperature is 45 DEG C.
4. a kind of endurance automobile gear treatment process as described in claim 1, which is characterized in that neon described in step (2)
Gas with neon and nitrogen are mixed to get by 3:1 volume ratio at normal temperatures and pressures in nitrogen mixed gas.
5. a kind of endurance automobile gear treatment process as described in claim 1, which is characterized in that neon described in step (2)
Gas and nitrogen mixed gas pressure are 38MPa.
6. a kind of endurance automobile gear treatment process as described in claim 1, which is characterized in that nitrogen described in step (3)
Gas and hydrogen normal temperature and pressure volume ratio are 2:1.
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|---|---|---|---|
| CN201811180907.5A CN109022724A (en) | 2018-10-11 | 2018-10-11 | A kind of endurance automobile gear treatment process |
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| CN201811180907.5A CN109022724A (en) | 2018-10-11 | 2018-10-11 | A kind of endurance automobile gear treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779457A (en) * | 2020-12-21 | 2021-05-11 | 河北领启机械设备有限公司 | Preparation method of slurry pump impeller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112779457A (en) * | 2020-12-21 | 2021-05-11 | 河北领启机械设备有限公司 | Preparation method of slurry pump impeller |
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Application publication date: 20181218 |